Step stool



FIG. 1 is a top, front, left side perspective view of a step stool,showing my new design;

FIG. 2 is a bottom, rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is a top, front, left side perspective view of the step stool ofFIG. 1 , showing the step platform in an alternate setting.

The broken lines in the figures depict portions of the step stool thatform no part of the claimed design.

CLAIM The ornamental design for a step stool, as shown and described.